damonbrodie
Member
There seems to be multiple "root causes". The initial heatpump/supermanifolds that came out seem to have had flaws. Many of the 2020 MYs had to have them replaced due to no heat. By sometime in early 2021 they had iterated through some designs and as of then the heathump/supermanifolds have been reliable.
I base the above on my experience - my April 2021 MYLR build lost heat on Dec 23 in -14C weather and the techs evaluated my car remotely and quickly came to the conclusion that my heatpump/supermanifold was not the issue directly. To reinforce that diagnosis, my heat started working again on the next drive (the outside temps warmed up a bit).
issue #1 - M3/MY builds up to early 2021 might have faulty equipment (heatpumps/supermanifolds).
Then there is the diagnosis of what happened in my case. The techs determined that in some cases in cold/snowy weather the front flap sticks open and the cold air was triggering the software to believe there was a fault in the heatpump and shutting down the heat entirely. The software fix that came in 2021.44.30.6 and .7 was to tell the software to keep the heatpump running even if the input temps are too low (such as when the grill is stuck open).
issue #2 - Sensor readings caused by front grill cause heat to be disabled. This seems to now be solved.
I doubt that the above two issues will be the end of the story. For one, Tesla has asked me to bring in my MY this coming week for an inspection. So perhaps there is something else they are looking into. Also, I'm wondering about the front grill/flap. If the conditions I was driving in were enough to cause that to stick open then I think there is more work needed there. It wasn't particularly wet or snowy out (though it was quite cold and windy) - I wonder about the robustness of the louvers to handle conditions when they are significantly worse than I experienced.
I base the above on my experience - my April 2021 MYLR build lost heat on Dec 23 in -14C weather and the techs evaluated my car remotely and quickly came to the conclusion that my heatpump/supermanifold was not the issue directly. To reinforce that diagnosis, my heat started working again on the next drive (the outside temps warmed up a bit).
issue #1 - M3/MY builds up to early 2021 might have faulty equipment (heatpumps/supermanifolds).
Then there is the diagnosis of what happened in my case. The techs determined that in some cases in cold/snowy weather the front flap sticks open and the cold air was triggering the software to believe there was a fault in the heatpump and shutting down the heat entirely. The software fix that came in 2021.44.30.6 and .7 was to tell the software to keep the heatpump running even if the input temps are too low (such as when the grill is stuck open).
issue #2 - Sensor readings caused by front grill cause heat to be disabled. This seems to now be solved.
I doubt that the above two issues will be the end of the story. For one, Tesla has asked me to bring in my MY this coming week for an inspection. So perhaps there is something else they are looking into. Also, I'm wondering about the front grill/flap. If the conditions I was driving in were enough to cause that to stick open then I think there is more work needed there. It wasn't particularly wet or snowy out (though it was quite cold and windy) - I wonder about the robustness of the louvers to handle conditions when they are significantly worse than I experienced.